Abstract
In recent past assembly of α-cyclodextrin (α-CD) functionalized carbon dots (α-CD-CDots) has been used in molecular recognition. These assemblies are effectively used for optical sensing by the help of electron transfer mechanism. Photoinduced electron transfer (PET) between CDots and surface-encapsulated derivatives of methyl viologen (MV2+) is used in the present work to follow the effect of the aggregated nanostructures. Formation of the nanoaggregates was confirmed by fluorescence anisotropy, atomic force microscopy (AFM), and scanning electron microscopy (SEM). These aggregated nanostructures are found to reinforce the electron transfer dynamics between CDots and MV2+. PET was confirmed from steady-state and time-resolved fluorescence along with ultrafast transient absorption measurements. The present work elaborates kinetic details of PET in the formed nanotubular aggregates. The reported concepts may be prospective toward development of light energy conversion devices.
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